Fatal error: Uncaught Error: Class 'Illuminate\Mail\Mailable' not found in /data/htmlwww/laravel-system/vendor/swoolecan/laravel-baseapp/src/Mail/Newsletter.php:9 Stack trace: #0 {main} thrown in /data/htmlwww/laravel-system/vendor/swoolecan/laravel-baseapp/src/Mail/Newsletter.php on line 9